Hooking class

#include <windows.h>
#include <iostream>
using namespace std;

class hook
{
public:
	DWORD m_Function_Start;
	DWORD m_Offset;
	DWORD m_Hook_Func;
	DWORD m_size;
	DWORD m_ret;
	hook(DWORD Function_Start,DWORD Offset,DWORD Hook_Func,DWORD size);
	hook();
        ~hook();
	void UnHook();
	void ApplyHook();
private:
	DWORD m_addr;
	BYTE* bOrig;
	BYTE* bHooked;
};

#include "hook.h"

hook::hook(DWORD Function_Start,DWORD Offset,DWORD Hook_Func,DWORD size)
{
	this->m_size = size;
	this->m_Function_Start = Function_Start;
	this->m_Hook_Func = Hook_Func;
	this->m_Offset = Offset;
	this->bOrig = (BYTE*)malloc(size);
	this->bHooked = (BYTE*)malloc(size);
	this->m_addr = Function_Start+Offset;
	this->m_ret = this->m_addr + this->m_size;
	DWORD dwRelAddr;
	dwRelAddr = (DWORD) (this->m_Hook_Func - this->m_addr) - 5;
	this->bHooked[0] = 0xE9;
	*(DWORD*)(this->bHooked+1) = dwRelAddr;
	for(int x = 5; x < this->m_size; x++)
		*(BYTE*)(this->bHooked+x) = 0x90;
	memcpy(this->bOrig,(void*)this->m_addr,this->m_size);
}
hook::hook()
{
	this->m_size = 0;
	this->m_Function_Start = 0;
	this->m_Hook_Func = 0;
	this->m_Offset = 0;
	this->bOrig = 0;
	this->bHooked = 0;
	this->m_addr = 0;
	this->m_ret = 0;
}
void hook::UnHook()
{
	DWORD dwOldProtect;
	VirtualProtect((LPVOID)this->m_addr, this->m_size, PAGE_EXECUTE_READWRITE, &dwOldProtect);
	memcpy((void*)this->m_addr,this->bOrig,this->m_size);
	VirtualProtect((LPVOID)this->m_addr, this->m_size, dwOldProtect, 0);
}
void hook::ApplyHook()
{
	DWORD dwOldProtect;
	VirtualProtect((LPVOID)this->m_addr, this->m_size, PAGE_EXECUTE_READWRITE, &dwOldProtect);
	memcpy((void*)this->m_addr,this->bHooked,this->m_size);
	VirtualProtect((LPVOID)this->m_addr, this->m_size, dwOldProtect, 0);
}
hook::~hook()
{
	free(bOrig);
	free(bHooked);
}

__declspec(naked) void nReset()
{
	_asm{
		pushad
		pushfd
	}
	if(pFont)
		pFont->OnLostDevice();
	hkReset.UnHook(); //Unhook to call orig function without a loop
	_asm{
		mov eax, [ebp+8d]
		push eax
		mov eax, [ebp+12d]
		push eax
		call hkReset.m_Function_Start
	}
	if(pFont)
		pFont->OnResetDevice();
	hkReset.ApplyHook();
	_asm{
		popfd
		popad
		mov edi, edi
		push ebp
		mov ebp, esp
		jmp hkReset.m_ret
	}
}

	hkReset = hook(D3D9_VTABLE[16],0,(DWORD)nReset,5);
	hkReset.ApplyHook();